Figure 5.

Optical neural plasticity of h-BN-encapsulated MoS₂ synaptic transistor. (a) Typical long-term potentiation of h-BN-encapsulated MoS₂ synaptic transistor under optical stimulation. (b) Magnification of the dotted circle area in (a). (c) Gain variation of different wavelengths (473, 532, 655 nm) and pulse numbers under laser stimulation. (d) Long-term synaptic weight changes at different wavelengths (473, 532, 655 nm) and pulse numbers under laser stimulation. (e) Gain variation of different wavelengths and laser powers under optical modulation. (f) Gain as a function of laser wavelength and frequency in optical modulation mode.